Introduction to the Seine River: The Seine River (English: Seine River; French: La seine) is a large river in northern France, with a total length of 780 kilometers (485 miles) and a total basin area of ​​78,700 square kilometers (30 , 400 square miles); it is one of the largest rivers of historical significance in Europe, and its drainage network accounts for the majority of French inland shipping traffic. Since the early Middle Ages it has been, above all, the River Paris; Paris was founded on some of its main crossings, and the interdependence of the river and the city is close and inseparable.